"use strict";

var levels = ["debug", "info", "warn", "error", "fatal"];

var BasicLogger = require("./logger/basic_logger"),
    NullLogger = require("./logger/null_logger"),
    Config = require("./config"),
    _ = require("./utils/helpers");

var Logger = module.exports = {
  setup: function(opts) {
    if (_.isObject(opts)) { _.extend(Config.logging, opts); }

    var logger = Config.logging.logger,
        level = Config.logging.level || "info";

    // --debug CLI flag overrides any other option
    if (_.includes(process.argv, "--debug")) {
      level = "debug";
    }

    logger = (logger == null) ? BasicLogger : logger;

    Logger.logger = logger || NullLogger;
    Logger.level = level;

    return Logger;
  },

  toString: function() {
    return Logger.logger.toString();
  }
};

Logger.setup();
Config.subscribe(Logger.setup);

levels.forEach(function(level) {
  Logger[level] = function() {
    if (levels.indexOf(level) >= levels.indexOf(Logger.level)) {
      return Logger.logger[level].apply(Logger.logger, arguments);
    }
  };
});